\section{Related Work}
\label{sec:related}


Most of the research is focused on the development of a suitable MAC layer, and
developing efficient applications for better scalability and manageability.  A
detailed analysis of inter-communication of nodes can be found
here~\cite{VDE:car-to-car}. The authors introduce the challenges of efficient
message dissemination, network scalability, and information security
mechanisms.


In fact, there are few academic publications describing the security
architecture of
VANETs~\cite{SASN:vehicular-security,privacy-vehicular,LCA-POSTER-2008-005};
none of them proposes specific protocols or considers practical issues,
although they provide detailed thread analysis.  The use of digital signatures
in the vehicular environment is discussed in~\cite{Gollan02digitalsignatures}.

In~\cite{data-vanets} the authors present a model that can effectively identify
data transmitted from malicious nodes. However their approach did not address
the security problem entirely and they focus on particular subjects.









